4-methyl-2-oxobutyrolactone, also known as 4-methyl-2-oxo-1,4-butanolidine, is a chemical compound with the molecular formula C5H8O3. It is a cyclic ester derived from 4-methyl-2-oxobutyric acid, featuring a five-carbon ring structure with a methyl group at the 4-position, a carbonyl group at the 2-position, and an oxygen atom bridging the 1 and 4 positions. 4-methyl-2-oxobutyrolactone is used as an intermediate in the synthesis of various pharmaceuticals, agrochemicals, and other organic compounds. It is typically synthesized through the reaction of 4-methyl-2-oxobutyric acid with a base, followed by intramolecular cyclization. Due to its reactivity and potential applications, 4-methyl-2-oxobutyrolactone is an important building block in organic chemistry.

1944-45-2

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Basic information
1. Product Name: 4-methyl-2-oxobutyrolactone
2. Synonyms: 4-methyl-2-oxobutyrolactone
3. CAS NO:1944-45-2
4. Molecular Formula:
5. Molecular Weight: 114.101
6. EINECS: N/A
7. Product Categories: N/A
Chemical Properties
1. Melting Point: N/A
2. Boiling Point: N/A
3. Flash Point: N/A
4. Appearance: N/A
5. Density: N/A
6. Refractive Index: N/A
7. Storage Temp.: N/A
8. Solubility: N/A
9. CAS DataBase Reference: 4-methyl-2-oxobutyrolactone(CAS DataBase Reference)
10. NIST Chemistry Reference: 4-methyl-2-oxobutyrolactone(1944-45-2)
11. EPA Substance Registry System: 4-methyl-2-oxobutyrolactone(1944-45-2)
Safety Data
1. Hazard Codes: N/A
2. Statements: N/A
3. Safety Statements: N/A
4. WGK Germany:
5. RTECS:
6. HazardClass: N/A
7. PackingGroup: N/A
8. Hazardous Substances Data: 1944-45-2(Hazardous Substances Data)

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Check Digit Verification of cas no

The CAS Registry Mumber 1944-45-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,9,4 and 4 respectively; the second part has 2 digits, 4 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 1944-45:
(6*1)+(5*9)+(4*4)+(3*4)+(2*4)+(1*5)=92
92 % 10 = 2
So 1944-45-2 is a valid CAS Registry Number.

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